Study on Antifungal Activity and Nano-selenization Application of Paenilbacillus polymyxa

YUAN Lianlian; LIU Tianbo; LI Xiaodong; DENG Zhengyu; TENG Kai; SHEN Lili; JIAO Yubing; WANG Yingwen; YANG Jinguang; LI Ying

doi:10.15933/j.cnki.1004-3268.2025.01.010

Abstract：In order to screen the microorganisms with good control effect for the control of crop fungal diseases,the disease resistance and nano-selenization of Paenobacillus polymyxa KZJ-1 were studied.The results showed that KZJ-1 bacteriological solution had good inhibition effect on Colletotrichum micotianae,Thanatephorus cucumeris,Thielaviopsis basicola and Phytophthora parasitica,with inhibition rates of 49.78％,53.64％,46.42％and 58.85％,respectively.In addition,the strain KZJ-1 could biosynthesize nano-selenium,and the active solution of nano-selenium with different concentrations had a good inhibitory effect on Phytophthora parasitica,and the inhibitory effect was enhanced with the increase of the concentration of sodium selenite added.At the same time,the pot experiment results showed that KZJ-1 and its nano-selenium active bacterial solution could effectively prevent and control tobacco black shank disease and promote the growth of tobacco plants.The disease index of tobacco black shank disease treated with nano-selenium active bacterial solution was the lowest after 7 days of irrigation,and the control effect reached 90.23％,and the control effect decreased slightly to 83.32％after 14 days,both of which were significantly higher than that of the control.The growth rate of plant height,maximum leaf length and maximum leaf width were 16.21％,31.74％and 33.61％,respectively.It can be seen that the biosynthesis of nano-selenium by strain KZJ-1 enhanced the disease resistance and growth promotion ability of the original strain,and had certain practical application value in production.